Low-Field Magnetic Separation of Monodisperse Fe3O4 Nanocrystals

  title={Low-Field Magnetic Separation of Monodisperse Fe3O4 Nanocrystals},
  author={Cafer T. Yavuz and J. T. Mayo and William W. Yu and Arjun Prakash and Joshua C. Falkner and Sujin Yean and Lili Cong and Heather J. Shipley and Amy T. Kan and Mason B. Tomson and Douglas Natelson and Vicki L. Colvin},
  pages={964 - 967}
Magnetic separations at very low magnetic field gradients (<100 tesla per meter) can now be applied to diverse problems, such as point-of-use water purification and the simultaneous separation of complex mixtures. High–surface area and monodisperse magnetite (Fe3O4) nanocrystals (NCs) were shown to respond to low fields in a size-dependent fashion. The particles apparently do not act independently in the separation but rather reversibly aggregate through the resulting high-field gradients… 
On Size Fractionation of Iron Oxide Nanoclusters by Low Magnetic Field Gradient
Particle size is one of the most important requirements for the successful implementation of magnetic nanoparticles in numerous scientific and engineering applications. Here we proposed the use of
High‐Moment Antiferromagnetic Nanoparticles with Tunable Magnetic Properties
Chemically synthesized superparamagnetic nanoparticles are widely used in biology and medicine for applications that include biomolecule purifications and cell separations, magnetic resonance imaging
Modified superparamagnetic nanocomposite microparticles for highly selective Hg(II) or Cu(II) separation and recovery from aqueous solutions.
The synthesis of a reusable, magnetically switchable nanocomposite microparticle, which can be modified to selectively extract and recover Hg(II) or Cu(II) from water, is reported. Superparamagnetic
Efficiency of High Gradient Magnetic Separation Applied to Micrometric Magnetic Particles
This article presents two prototypes of laboratory magnetic separators that generate high gradient magnetic fields. Such a field is created in a separation cell via steel wool. The efficiency of
Challenges associated to magnetic separation of nanomaterials at low field gradient
Abstract Magnetic nanoparticles (MNPs) have been proposed as one of the effective tools for pollutant removal from aqueous environment. In most of the new strategies investigated, which involved the
The Effect of pH and Viscosity on Magnetophoretic Separation of Iron Oxide Nanoparticles
Magnetic nanoparticles (MNPs) are used for magnetophoresis-based separation processes in various biomedical and engineering applications. Essential requirements are the colloidal stability of the
Sedimentation and aggregation of magnetite nanoparticles in water by a gradient magnetic field
Magnetite (γ-Fe3O4) nanoparticles are promising effective sorbents for water cleaning of heavy metal, radionuclides, organic and biological materials. A good sorption capacity can be achieved due to
Magnetic BaFe12O19 nanofiber filter for effective separation of Fe3O4 nanoparticles and removal of arsenic
Magnetic nanoparticles are promising in applications where magnetic separation is intended, although material losses via leaching mechanisms are often inevitable. Magnetic separations with widely
Aligned Fe3O4 magnetic nanoparticle films by magneto-electrospray method
This work reports for the first time the preparation and evaluation of aligned Fe3O4 nanoparticle films via a magneto-electrospray method, i.e., electrospray under a magnetic field. The magnetic
Low-Gradient Magnetophoresis through Field-Induced Reversible Aggregation
Recent experiments (Yavuz, C. T. et al., Science 2006, 314, 964) show the possibility of low gradient magnetophoretic separation of superparamagnetic nanoparticles in aqueous solution, a process with


High-Gradient Magnetic Separation of Magnetic Nanoclusters
The capture of magnetic nanoclusters in high-gradient magnetic separation (HGMS) operations, the rate-limiting step in magnetic nanoparticle-based separations and chemical processing, was studied
Magnetic separation of nanoparticles
Magnetic particles in the nanometer size range can be captured by sufficiently large magnetic forces in competition with thermal diffusion. This paper reports on the results of applying two types of
Nano-aggregates of hexacyanoferrate (II)-loaded magnetite for removal of cesium from radioactive wastes
Abstract Nano-sized magnetic sorbents can be promising candidate materials for treatment of low-level effluents resulting in effective decontamination and very high volume reduction of radioactive
Magnetic Characteristics of Ferrimagnetic Microspheres Prepared by Dispersion Polymerization
A magnetite-based colloid was obtained by chemical co-precipiration of iron(II) and iron(III) salts in alkaline medium and stabilized with oleic acid. Magnetic micron-size poly(2-hydroxyethyl
High‐gradient magnetic separation of coated magnetic nanoparticles
The feasibility is examined of using high-gradient magnetic separation (HGMS) to recover about 8-nm magnetite nanoparticles that are tailored specifically to extract target solutes (polymer-coated
New magnetic nanoparticles for biotechnology.
The stability of the oleic acid ligand of Co nanocrystals has been investigated and this ligand system provides sufficient protection against oxidation and predicts the experimentally realized FeCo nanoparticle composition as a function of the particle size fairly well.
Size-controlled synthesis of magnetite nanoparticles.
The reported procedure can be used as a general approach to various ferrite nanoparticles and nanoparticle superlattices.
Static and dynamic magnetic properties of spherical magnetite nanoparticles
We present a detailed study of static and dynamic magnetic behavior of Fe3O4 nanoparticles with average particle sizes 〈d〉 ranging from 5 to 150 nm. Bulk-like properties such as saturation
Protein Separations Using Colloidal Magnetic Nanoparticles
Phospholipid‐coated colloidal magnetic nanoparticles with mean magnetite core size of 8 nm are shown to be effective ion exchange media for the recovery and separation of proteins from protein
This work proposes an enhanced nanolevel magnetic separation model considering flow limitations using simplifying assumptions. The theoretical model builds on magnetic heteroflocculation models